Generation method for preamble symbol in physical frame

Abstract

The invention discloses a generation method for a preamble symbol in a physical frame. The generation method comprises that a time-domain OFDM symbol is obtained; the length of a cyclic prefix is determined; a time-domain OFDM symbol in the cyclic-prefix length is cut from the time-domain OFDM symbol and serves as the cyclic prefix; a modulation signal is generated according to the cut time-domain OFDM symbol in the cyclic-prefix length; and the preamble symbol is generated on the basis of the cyclic prefix, the time-domain OFDM symbol and the modulation signal. On the premise that the length of the modulation signal is determined, different initial positions are selected from the part, used for cutting the cyclic prefix, of the time-domain OFDM symbol to transmit signaling information on the basis of the length of the modulation signal. The generation method of the invention can be used to solve the problems that a DVB_T2 time-domain structure in DVB_T2 and other standards at present cannot adapt to coherent detection due to lack of a cyclic prefix, and that detection via a low-complexity reception algorithm may cause failure when the preamble symbol is in a complex frequency selective fading channel.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201410184919.0, the application date is May 4, 2014, and the invention name is "Method for generating leading symbols in physical frames". technical field [0002] The invention relates to the technical field of wireless broadcast communication, in particular to a method for generating a leading symbol in a physical frame. Background technique [0003] Generally, in order for the receiving end of the OFDM system to correctly demodulate the data sent by the sending end, the OFDM system must realize accurate and reliable time synchronization between the sending end and the receiving end. At the same time, since the OFDM system is very sensitive to the frequency offset of the carrier, the receiving end of the OFDM system also needs to provide an accurate and efficient carrier spectrum estimation method to accurately estimate and correct the carri...

AI Technical Summary

Problems solved by technology

[0009] The problem solved by the present invention is that in the current DVB_T2 standard and other standards, there is no cyclic prefix in the DVB_T2 time domain structure, which cannot be applied to coherent detection, and the preamble symbol has a low probability of failure in the detection of low-complexity receiving algorithms under complex frequency selective fading channels. question

Images